> > The answer was probebly 127.0.1.3. I guess you do not have any rules
> > to hit on this value.
>
> Why should it issue the query and neglect the answer?

Because the same dbl.spamhaus.org zone is used for other related and older
rules as well. All rules referring to the same zone result in a single
query. When a result comes in, it is checked against individual rules.